Clock rebushing tool



. July 2, l957 E. A. LABENz 2,797,598

CLOCK REBUSHING TOOL Filed May 8.. 1956 2 SheetsFSheet 1 1516.1 v vT162.

ATTO QH EVS States Summarized briefly, the present invention is a toolfor the purpose of rebushing and repairing worn pivot holes in a clock,without the necessity of wholly or partially `disassembling the clock.The tool devised for this purpose includes a generally C-shaped frame,having a foot adapted to receive wheel shafts of clocks. Assembled withthe upper leg of the frame is a vertically disposed crown and adjustablevertically within the crown and lockable in selected positions to whichit is `so adjusted, is a tubular shaft, keyed to the crown againstrotation relative thereto. A cutting bar, having a han'd wheel forrotating the same, is journaled in the tubular shaft, and is also oftubular formation. Fhe cutting bar is adapted at its lower end, adjacentthe foot of the frame, to receive various types of rotary cuttersadapted for cutting out worn pivot holds in a plate of a clock to permitthe insertion of new ybushings or the cutting of bushings from pieces ofplate stock. Vertically shiftable within the cutter bar is any one of aplurality of punches for lining up the tool for making new bushings andfor lining up the tool with pivot holes made in bushings that are beingCut. v

Heretofore, thegeneral practice among clock makers, when rebushing aclock, is to disassembly the movement, either wholly or partially, dueto the necessity of removing and working on various wheel shafts or thelike that may need rebushing 'due to worn pivot holes. ySeparate toolsare required for roaming worn holes for the insertion of new bushings,and separate tools are further required for making new bushings. lnaddition, it has been Vgenerally necessary to purchase bushing platematerial for the purpose of making the new bushings, All in all, thegeneral practices followed involve an excessive consumption of time sofar as the clock maker is .concerned, as well as the expenditure ofconsiderable elort and funds.

The matin object of the present invention is to provide, in a singletool, means for simplifying the task that hais heretofore been involvedin clock rebushing work, so that all operations can be performed inminimum time, and with minimum effort, without the necessity of whollyor partially Idlisass-embling the clock.

Another object is to provide a tool of Vthe 'type described which is sodesigned as to facilitate the making of new bushings from the plate ofthe movement being worked on, if desired, to eliminate the lcost ofhaving to buy bushing plate material or new bushings.

, Another object is to provide, in a single tool', inter changeable toolelements which can be selectively 'employed for the purpose of rearningout, that is cutting away the edges of, worn pivot holes for theinsertion of new bushings, lining up thetoolelements with the clockpivots or with holes formed in newly made bushings, .and per- 2,797,598Patented July 2, 1957 tion, the claims appended thereto, and from theannexed drawings in which like reference charactens designate like parththroughout the several views and wherein:A

Figure l is a sid-e elevational View of a clock rebushing tool formedaccording to the present Iinvention, as it appears when in use;

Figure 2 is an elevational view of the tool as seen from the left ofFigure l;

Figure 3 is an enlarged section on line 3-3 of Figure l;

Figure 4 is a longitudinal section on an enlarged scale, online 4-4 ofFigure 2;

Figure 5 is a detail sectional view through the tool head and frame, thescale being enlarged still further, on line S-S of Figure 4;

Figure 6 is a fragmentary, exploded perspective view on an 'enlargedscale showing the lower end of the tool bar and an associated cutter;

Figure 7 is a perspective View of a pivot hole line up punch per se; and

Figure 8 is an enlarged, fragmentary sectional view'on the same cuttingplane as Figure 4, with the punch inserted. Referring to the drawings inldetail, the tool constituting the present invention includes a framegenerally designated att). The frame is approximately C-shaped,

' including a curved, inclined bright portion 12 menging at formingrelated operations, all without disassembly of the clock movement, dueto Vthe formationpf the tool in such a manner that access is had to allwheel shafts that may need rebushing without s uch disassembly., Othervobjects will appear from the `following descripits upper end into ahorizontally 'disposed upper leg 14, and at its lower end into ahorizontally disposed lower leg or foot 16.

Referring to Figure 4, formed in the upper leg 1 4 is a large,smooth-walled opening 18. Supported upon the upper leg is a crown orshaft support body 20, having at its lower end a reduced, depending,axial extension 22 defining a circumferential, downwardly facingshoulder 23 contacting the top` surface of leg i4. Extension 22 at itsfree end is threaded as at 24, for engagement with a lock nut 26, which,when threaded against the underside of leg 1d, xedly but removablymounts the crown on the frame.

The crown 2@ has an end to end, smooth-walled, vertical bore andengagedslidably therein is a threaded tubular, cutter adjusting bar 2S.rA set screw 30, threaderdly engaged in a radial opening of crown 20,has a reduced inner end slidably engaged in a longitudinal slot orkeyway formed in and extending end to end from bar 28.

Threaded upon the upper portion of the bar 28 is a nut 34 for thepurpose of limiting downward movement of the bar 28 within the |crown toa predetermined extent, to adjust the depth of cut made by cutterscarried by the tool.

For the purpose of eiiecting axial adjustments of the bar 28 within thecrown 20, there is provided a large diameter, flat adjusting screw ortdisc 35 having a center opening threaded for engagement with the bar28, said screw 35 underlying the nut 26 and being adapted to bearagainst the nut 26 during the making of axial adjustments of the bar 28,

lnsertable in the bar 28 is an elongated, tubular shaft 36, constitutinga cutter bar, and iixedly connected to the shaft is a hand wheel 38having a handle 40.

Referring now to Figure 6, any of various cutters can be engaged withthe lower end of the cutter bar 36 for yrotation therewith within thecutter adjusting bar 28. The illustrated cutter in Figure 6 has beendesignated at 4 2., and is used for the purpose of cutting new bushingsfrom a plate i).

respondingly disposed recesses 48 4formed in the lower end of the bar36.

In this way, the `cutter 42 can be engaged with the bar 36, by`insertion of extension 44 in the lower end of the Vshaft 28, theprovision of the extension 44 defining an upwardly facing shoulder 49bearing against the lower extremity of the bar 28.

Depending from the bight portion of the cutter 42 is an annular cutterblade 50 serrated on its lower edge for the purpose of cutting throughthe plate P.

`Various othercutters can be selectively assembled with the bar 36, `andfor example, another cutter would have the same general form as thatshown in Figure 6, except for having a smaller cutting blade, such othercutter being Vused for cutting out a pivot hole to receive a newbushing,

while vthe cutter of Figures 4 and 6 would be used for cutting thebushing itself at its outer periphery from a piece of plate stock. Thecutters used for cutting or `making bushings would have blades ofdierent sizes, and

the cutters used for reaming out or enlarging worn pivot holeswould alsobe of various sizes to tit holes of correwhich is formed with a knurledhead 54. At its lower end, the shank 52 is cut off squarely, and has adownwardly opening, axial recess 56 adapted to receive the wheel shaft Sof a clock movement generally designated at M. In the foot 16 there isformed a slot opening upon the free end of the foot, said slot beingincreased in length and width in the direction of the bottom surface ofthe foot 16 through the provision `of a series of steps 62. As a result,the slot is adapted for receiving shafts of various diameters.

A second line-up punch `has been designated at 66, and at one endincludes a reduced portion 68 merging into a knurled `head 70, the otherend 72 being conically tipped. This punch is shown inserted in the toolin Figure 8, in substitution `for the punch 52 shown in Figure 4.

As previously pointed out, the tool permits rebushing operations,involving either the cutting out of worn pivot holes, or the making ofnew bushings including the formation of pivot holes in said newbushings. As shown in Figures `4 and 5, the'provision of the steppedslot in the foot or lower `leg 16 of the frame permits the foot to beslipped over the wheel shaft S of a clock movement generally designatedat M. The crown will have been securely tightened, through the use ofnut 26, to the frame so that the frame and crown constitute a stationarysupport means for the device.

The outer shaft orcutter adjusting bar 28 slides in an axial directionwithin the b ore ofthe crown, and as previously noted,` is held againstYrotation relative to the crown through the keyway 32 and set screw 30.This is to insure that the outer shaft will not turn when cutting toolsare being used.

The nut 34 is now adjusted axially of the shaft 28 a selected distanceabove the upper end of the crown. This distance is the depth of the cutto be made, it being understood that initially, the outer shaft 28 wouldbe in its uppermost position shown in Figure 4, bearing against a cutter42. When the cutter moves downwardly through the work, the shaft 28 willslide downwardly within the crown, and ultimately, when the cutter haspenetrated the work to the necessary depth, the nut 34 will engage theupper end of crown 20. p

In use, as a lirst step one opens the gaps between the foot 16 and thelower end of the bar 28 with a cutter 42 interlocked with the cutterholding bar 36. Then, by rotating nut 34 in a direction such. that itwill engage the upper end of crown 20, and by further rotating nut 34after it has so engaged the crown, the bar 28 will be elevated untilultimately the cutter will clear the pivot S of the clock movement Mthat is being worked on. Then, the foot of the frame is slid intoposition with the pivot of the clock in the stepped slot 62. Then, theouter shaft 2S is axially adjusted through the use of the nut 34 onceagain, for the depth of the cut to be made. Then, the large diameter nut35 is threaded upwardly to hold the shaft 23 against movement upwardlyfrom the top surface of the clock plate P. Then, punch 52, selectedaccording to the size of the diameter of the recess 56 thereof, isinserted in the bore of the cutter holder bar 36, so as to t into thepivot S of the clock wheel. The clock wheel is then lined up in trueposition.

While holding the line-up punch or stem 52 down upon the pivot of theclock movement, nut 35 is tightened against the underside of the crown,after which the hand wheel is turned in a direction to cause the cutterto start cutting into the plate. As the hand wheel is turned, a slowrotation of nut 35 is effected by the user, in a direction to tightennut 35 against the crown, and this causes the shaft 2S to move slowlydownwardly as it rotates, to cause the cutter to be advanced through theclock plate.

After the cut has been completed, the outer shaft 28 is elevated byloosening nut 35. In this way, the hole for a new bushing iscut.

To replace a bushing in the clock plate one may simply press in apreviously manufactured bushing or standard part. However, if there arenone of these at hand, one can make a bushing from a piece of metal thesame thickness, as the plate P from which the old bushing or worn'pivotbearing was cut from. A hole is drilled in said piece to a diameterequal to that of the pivot shaft aperture desired. Then, with line-uppunch 66 (see Fgure 8) inserted in the bore of holder bar 36, the tip 72of the line-up punch or stern is inserted in the newly drilled apertureA of Figure 8.

The procedure hereinbeforc described [or the purpose of cutting out ahole for a bushing is now followed, except that now one uses a largercutter, designed to provide a bushing, of a diameter of the same size asthe aperture cut inthe clock plate P, in the lmanner previously dc-4scribed herein. The new bushing is then pressed into jplace in thepreviously cut aperture, thus providing a new bushing for the pivotshaft S of the clock movement.

By reason of the construction illustrated and described, the tool hasthe desirable characteristics wherein by means of a simple series ofoperations, a clock can be rebushed in arelatively short time and withlittle work and expense so faras the clock maker is concerned. One isable to work upon the clockV movement without disassembling the same,since the tool will tit in and reach any wheel shaft or the Vlike thatmay need rebushing due to worn pivot holes. The operation takescomparatively little time, and with the advantage of a unitary assembly,new bushings can be made in the same simple series of operational stepsrequired in making a hole for the new bushing. The tool can cut the newbushing, in fact, directly from the plate of the movement being workedupon, thus eliminating the cost of bushing platematerialor bushings soldas separate parts to clock makers.

What is claimed is:

l. A clock rebushing tool comprising a frame; a crown mounted on theframe and having an axial bore; a tubular shaft slidably mounted in thebore for axial movement, saidshaft having a keyway. and the crownincluding a key engagingintherkeyway to hold the shaft against rotationi relative to the crown and frame; means to adjust the shaft in an axialdirection, comprising a nut threaded upon lthe shaft below the crown toengage the crown when the nut is rotated in one direction; a tubular barrotatably mounted in theshaft; cutter means separably connected to thebar :for` rotation therewith and engageable against one end of theAshaft for axial adjustment with the shaft, `for advancement fof thecutter means toward a work piece having an. aperture `aboutwhich thework piece is to be cut, responsive to rotation of the bar and axialadjust- O ment of the shaft toward the work piece resulting from turningof said nut while in engagement with the crown; and a line-up steminsertable through the tubular bar for engagement in the aperture tohold the work piece with the aperture thereof centered relative to thecutter means.

2. A clock rebushing tool comprising a frame; a crown mounted on theframe and having an axial bore; a tubular shaft slidably mounted in thebore for axial movement, said shaft having a keyway and the crownincluding a key engaging in the keyway to hold the shaft againstrotation relative to the crown and frame; means to adjust the shaft inan axial drection, comprising a nut threaded upon the shaft below thecrown to engage the crown when the nut is rotated in one direction; atubular bar rotatably mounted in the shaft; cutter means separablyconnected to the bar for rotation therewith and engageable against oneend of the shaft for axial adjustment with the shaft, for advancement ofthe cutter means toward a work piece having an aperture about which thework piece is to be cut, responsive to rotation of the bar and axialadjustment of the shaft toward the work piece resulting from turning ofsaid nut while in engagement with the crown; and a lineup steminsertable through the tubular bar for engagement in the aperture tohold the work piece with the aperture thereof centered relative to thecutter means, the cutter means comprising a rotary cutter having anannular, serrated blade.

3. A clock rebushing tool comprising a frame; a crown mounted on theframe and having an axial bore; a tubular shaft slidably mounted in thebore for axial movement, said shaft having a keyway and the crownincluding a key engaging in the keyway to hold the shaft againstrotation relative to the crown and frame; means to adjust the shaft inan axial direction, comprising a nut threaded upon the shaft below thecrown to engage the crown when the nut is rotated in one direction; atubular bar rotatably mounted in the shaft, cutter means separablyconnected to the bar vfor rotation therewith and engageable against oneend of the shaft for axial adjustment with the shaft, for advancement ofthe cutter means toward a work piece having an aperture about which thework piece is to be cut, responsive to rotation of the bar and axialadjustment of the shaft toward the work piece resulting from turning ofsaid nut while in engagement CII with the crown; and a line-up steminsertable through the tubular bar for engagement in the aperture tohold the work piece with the aperture thereof centered relative to` thecutter means, the cutter means comprising a rotary cutter having anannular, serrated blade, said cutter including lugs angularly spacedabout the circumference thereof, the tubular bar having recesses in oneend thereof receiving said lugs to effect the separable connection ofthe bar and cutter to one another while linking the same for jointrotation.

4. A clock rebushing tool comprising a frame; a crown mounted on theframe and having an axial bore; a tubular shaft slidably mounted in thebore for axial movement, said shaft having a keyway and the crownincluding a key engaging in the keyway to hold the shaft againstrotation relative to the crown and frame; means to adjust the shaft inan axial direction, comprising a nut threaded upon the shaft below thecrown lto engage the crown when the nut is rotated in one direction; atubular bar rotatably mounted in the shaft; cutter means separablyconnected to the bar for rotation therewith and engageable against oneend of the shaft for axial adjustment with the shaft, for advancement ofthe cutter means toward a work piece having an aperture about which thework piece is to be cut, responsive .to rotation of the bar and axialadjustment of the shaft toward the work piece resulting from turning ofsaid nut while in engagement with the crown; a lineup stern insertablethrough the tubular bar for engagement in the aperture to hold .the workpiece with the aperture thereof centered relative to the cutter means,the cutter means comprising a rotary cutter having an annular, serratedblade, said cutter including lugs angularly spaced about thecircumference thereof, the tubular bar having recesses in one endthereof receiving said lugs to effect the separable connection of thebar and cutter to one another While linking the same for joint rotation;and means for limiting the depth of penetration of the cutter into thework, comprising a second nut threaded upon the shaft above the crownand adapted to engage the upper end of the crown responsive to axialmovement of the shaft toward the work through a predetermined distance.

References Cited in the file of this patent UNTED STATES PATENTS 713,000Ford Nov. 4, 1902 1,449,361 Wink Mar. 20, 1923 2,341,926 Lauby Feb. l5,1944 2,729,993 Preller Ian. l0, 1956

